Reversible filter.



No. 788,742. PATENTED MAY 2, 1905. T. M. WESTON.

REVERSIBLE FILTER.

APPLICATION FILED APB..14=. 1904.

a? Mama/W8 555 Patented May 2, 1905.

THOMAS M. l/VESTON, OF MELROSE, MASSACHUSETTS.

REVER$lBLE FILTER" SPECIFICATION forming part of Letters Patent No.788,74z2, dated May 2, 1905.

Application filed April 14, 1904. Serial No. 203,101.

To all whom it rim/y concern:

Be it known that I, THOMAS M. WESTON, a citizen of the United States,residing in Melrose, in the county of Middlesex and State oflVIassachusetts, have invented an Improvement in Reversible Filters, ofwhich the following description, in connection with the accompanyingdrawings, is a specification, like letters on the drawings representinglike parts.

This invention relates to a reversible faucetfilter, and has for itsobject to provide a novel filter of this class which is easy to cleanand repack, in which all joints between the parts are made absolutelywater-tight, and in which there are no shoulders or annular recesses inwhich eddy-currents can form while the water is running, and which serveas chambers to catch dirt and other impurities. This latter I regard asperhaps the most important feature of my invention, becausein a goodmany filters with which I am familiar such annular chambers do exist,and my experience in this line demonstrated thatsuch chambers becomefilled or clogged with impurities which are gradually washed out whenthe filter is reversed, and thus are delivered in the water, which issupposed to be pure.

The features wherein my invention resides will be herein described andparticularly pointed out in the appended claims.

In the drawings, Figure l is a side view of my improved filter. Fig. 2is a sectional view of the same, one of the caps being detached. Fig. 3shows a section through the filter as it is applied to the faucet, andFig. at is a top plan view.

The filter comprises the body portion 3, having at each end a shoulder1, on which rest sieves 5. I prefer to use a plurality of sieves ofdifferent degrees of fineness, though my invention is not limited to theuse of any particular number or grade of sieves. Between the two sieves5 and within the body 3 is liltering material 6, which may be of anysuitable material or usual composition for cleansing'and disinfectingwater. The ends of the body portion 3 are screw-threaded interior-1y, asat 7, and engaging said interior screw threads at each end of the filteris a detachable cap or end piece 8. This end piece has a peculiarconstruction, it having the interior screw-threaded portion 9, which isscrewed to the faucet, and the interior annular shoulder 10, on whichthe end of the faucet rests, and the depending extcriorly-screw-threadedportion 11, the screw-threads engaging the screwthreads 7 of the bodyportion 3. Said cap is also provided with an annular skirt or flange 12,which overlies and incloses the extreme end of the body portion.

The end of the flange portion 11 is beveled, as at 14, and said beveledportion is adapted to engage a gasket 15, of rubber or similar, elasticmaterial when the parts of the filter are assembled. I also prefer touse another gasket or washer, 16, in the recess or groove formed betweenthe flanges 11 and 12, said gasket engaging the end of the body 3. Whenthe parts are assembled, therefore, the joint between each cap 8 andbody 3 is doubly packed, and thus an absolutely-tight waterjoint iseffected. The length of the flange 11 is such that when the parts areassembled its ends engage the adjacent sieves 5 and hold them inposition, thus doing away with the spring or wire ring usually used infilters for this purpose and which causes an eddy that soon becomesfilled with dirt that is free to drop out any time the filter isreversed.

Each cap has a peculiar interior shapc-- that is, the interior diameterat the base of the flange 11 is the same as the interior diameter of thefilter-body 3, while the interior diameter of the most contractedportion or throat 18 is the same as the interior diameter of the faucet..The portion of the cap between the end of the flange 11 and the throat18 is tapered or curved, as shown. This 1 regard as very important,because when the filter is assembled and applied to the faucet there areno annular chambers formed by abrupt shoulders or between such shoulderson the faucet side of the filtering material, in which dirt and otherimpurities can gather.

lVith my construction, therefore, as soon as the filter is reversed thefirst flushing of water absolutely cleans the interior of the cap at thelower end, and there is no danger that any impurities which haveaccumulated in such a chamber will be gradually dislodged after thefaucet is supposed to have been flushed out.

The improved faucet is extremely simple to manufacture and effective inoperation.

VVhilel have shown herein the preferred form of my invention, I do notwish to be limited to the exact construction shown, as various changesin the shape of the parts may be made without departing from theinvention.

Having described my invention, what I claim as new, and desire to secureby Letters Patent, is-

1. In a reversible faucet-filter, a hollow body portion having acentralbore, said bore being enlarged at each end of the body portion therebyforming outwardly-facing shoulders, the enlarged portions of the borebeing interiorly screw-threaded, sieves resting on said shoulders andfiltering material between the sieves, a cap on each end of the bodyportion, each cap having an eXteriorly-screwthreaded portion to engagethe interiorlyscrew-threaded portion of the body, and an encirclingflange between which and the exteriorly-screw-tlneaded portion, the endof the body is received, said eXteriorly-screw-threaded portion of thecap engaging the sieve an'd clamping the same between itself and theshoulder of the body portion, and also having a tapered end and a gasketengaging said tapered end, each cap having smooth interior walls andhaving a diameter at its inner end equal to the smaller diameter of thebore of the body.

2. In a reversible faucet-filter, a hollow body portion having a centralbore, said bore being enlarged at each end of the body portion therebyforming outwardly-facing shoulders, the enlarged portions of the borebeing interiorly screw-threaded, sieves resting on said shoulders,filtering material between the sieves, a cap on each end of the bodyportion, each cap having an eXteriorly-screw-threaded portion to engagethe interiorly-screw-th readed portion of the body, and an encirclingflange between which and the eXteriorly screwthreaded portion: the endof the body is received, said eXteriorly-screw-threaded portion of thecap having a beveled end, and a gasket engaged by said beveled end.

3. In a reversible faucet-filter, a tubular body portion, the bore ofwhich is enlarged at each end to form outwardly-facing shoulders, saidenlarged portions of the bore being interiorly screw-threaded, sievesresting on said shoulders, filtering material between the sieves atopposite ends of the body portion, and a cap on each end of the bodyportion, each cap having at one end an exteriorlyscrew-threaded portionto engage the interiorly-screw-threaded portion of the body and at theother end being constructed to be secured to a faucet, the bore of eachcap having smooth walls and being at its outer end of exactly the samediameter as the smaller diameter of the bore of the body portion.

4. A reversible faucet-filter comprising a body having at each endinterior screw-threads terminating at an outwardly-facing shoulder,sieves on each of said shoulders, filtering ma terial between thesieves, and a cap at each end of the faucet, each cap having its outerend formed for attachment to a faucet, and at its inner end having aneXteriorly-threaded nose to engage the interior screw-threads of thebody, and a flange concentric with the nose, said flange lying outsideof the end of the body when the parts are assembled, a gasket betweenthe end of the nose and the interior walls of the body, and anothergasket between the nose and said flange of the cap and seating on theend of the body.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

THOMAS M. WVESTON.

\Vitnesses:

A. A. WELCOME, J OSEPH LOVALLY.

